[MemProf] Fix buildbot errors by requiring zlib

This should fix errors like the following from using the raw
memprof_pgo.profraw profile in a212d8da94d08e229aa8d65283e4b116310bba10:

profile uses zlib compression but the profile reader was built without zlib support

E.g.
https://lab.llvm.org/buildbot/#/builders/196/builds/18536

diff --git a/llvm/test/Transforms/PGOProfile/memprof.ll b/llvm/test/Transforms/PGOProfile/memprof.ll
index 6cb3626..0792aa1 100644 (file)
--- a/llvm/test/Transforms/PGOProfile/memprof.ll
+++ b/llvm/test/Transforms/PGOProfile/memprof.ll
@@ -1,3 +1,5 @@
+; REQUIRES: zlib
+
 ;; Tests memprof profile matching (with and without instrumentation profiles).
 
 ;; TODO: Use text profile inputs once that is available for memprof.